TM 10-6630-222-12&P
OPERATOR AND UNIT MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)
FOR WATER QUALITY ANALYSIS SET: PURIFICATION (WQAS-P)
OPERATOR TROUBLESHOOTING PROCEDURES
GENERAL.
The following is a list of common malfunction symptoms that may occur with your equipment. Each symptom is followed
by a branching logic tree for troubleshooting. Follow the actions given in the order presented. The following cannot list all
the possible symptoms that may occur with your equipment or all the possible branches in each logic tree. If the symptom
you are experiencing is not listed or actions given in the logic tree do not correct it, notify unit maintenance.
SYMPTOM
Ultrameter will not operate or gives erratic readings.
MALFUNCTION
Meter shows no display when switched on.
CORRECTIVE ACTION
Replace battery if it appears to be defective.
CORRECTIVE ACTION
If battery is not inserted properly (correct polarity) reverse connections.
If battery is inserted properly, notify unit maintenance.
MALFUNCTION
Meter shows inaccurate pH readings.
CORRECTIVE ACTION
Recalibrate Instrument. If problem is solved, continue operation.
If problem is not solved, check for cross-contamination from residual pH buffers or samples in
sensor well.
If problem is not solved, recalibrate using fresh buffers.
If problem is not solved, check sensor for cracks. If cracks appear, replace the sensor.
If problem is not solved, notify unit maintenance.
MALFUNCTION
Meter shows erratic or out of range reading on display, Meter will not adjust down to pH7.
CORRECTIVE ACTION
Check, Clean and rejuvenate sensor and recalibrate. If problem is solved, continue operation.
If problem is not solved, replace the sensor. If problem is solved, continue operation.
If problem is not solved, notify unit maintenance.
MALFUNCTION
pH reading drift or respond slowly to changes in buffers/samples or FAC is displayed repeatedly.
CORRECTIVE ACTION
Check, Clean and rejuvenate sensor and recalibrate. If problem is solved, continue operation.
If problem is not solved, replace the sensor. If problem is solved, continue operation.
If problem is not solved, notify unit maintenance.
MALFUNCTION
CORRECTIVE ACTION
Clean cell cup and electrodes. If problem is solved, continue operation.
If problem is not solved, clean again using new solution. If problem is solved, continue operation.
If problem is not solved, notify unit maintenance.
MALFUNCTION
CORRECTIVE ACTION
Rinse cell cup more thoroughly before measurement. Insure pH cap is snugly in place. If problem is
solved, continue operation.
If problem is not solved, check for possible contamination from previous sample or from pH sensor
well. Rinse cell again. If problem is not solved, notify unit maintenance.
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